Influence of Particle Association and Suspended Solids on UV Inactivation of Fecal Indicator Bacteria in an Urban River
Influence of Particle Association and Suspended Solids on UV Inactivation of Fecal Indicator Bacteria in an Urban River
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DOI：
10.1007/s11270-013-1822-8
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发表时间：
2014-01-01
影响因子：
2.9
通讯作者：
Horn, H.
中科院分区：
文献类型：
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作者：
Walters, E.;Graml, M.;Horn, H.
为了评估和准确预测河流的肠道污染的自我净化能力，对水体中的分散、颗粒缔合和失活等机制的透彻理解至关重要。在这项研究中，我们首先进行了粒径分布分析的废水，并调查了大肠杆菌和肠球菌负荷的每个尺寸级分。结果表明，E.大肠杆菌和83%的肠球菌与小于或等于12 μ m的颗粒有关。大于63 μ m的颗粒对总E的贡献小于1%。大肠杆菌和肠球菌载量。基于这些结果，进行批实验，以研究颗粒大小和总悬浮固体（TSS）浓度对两种粪便指示细菌（FIB）的UV灭活的影响。与FIB相关的颗粒大小与其UV灭活率之间存在直接关系。E.与小于或等于12 μ m的颗粒相关的大肠杆菌和肠球菌的灭活平均比与12至63 μ m的较大颗粒部分相关的大肠杆菌和肠球菌的灭活快2倍和1.7倍。另外还发现，随着TSS浓度的增加，UV灭活率降低。然而，在TSS浓度高于约100 mg L-1时注意到UV灭活的拖尾效应。
In order to assess and accurately predict the self-purification capabilities of rivers with respect to enteric pollution, a thorough understanding of mechanisms such as dispersion, particle association, and inactivation in the water column is crucial. In this study, we firstly performed particle size distribution analyses of wastewater and investigated the Escherichia coli and enterococci loadings of each size fraction. It was seen that 91 % of E. coli and 83 % of enterococci were associated with particle sizes less than or equal to 12 mu m. Particles larger than 63 mu m contributed less than 1 % to overall E. coli and enterococci loadings. Based on these results, batch experiments were performed to investigate the effect of particle size and total suspended solids (TSS) concentration on UV inactivation of the two fecal indicator bacteria (FIB). A direct relationship between the particle size to which FIB were associated and their UV inactivation rate was noted. E. coli and enterococci associated with particles smaller than or equal to 12 mu m were inactivated on average 2x and 1.7x faster than those associated with the larger particle fraction of 12 to 63 mu m. It was additionally seen that as the TSS concentrations increased, the UV inactivation rates decreased. A tailing effect of UV inactivation was however noted at TSS concentrations above approximately 100 mg L-1.